We can call Python code in C via the Python C API. And we want to be able to go over the items for a PyList that is type of PyObject, for example, the following “path” variable is type of PyObject, and we can insert/append item(s) to it via PyList_Append.
1 2 | PyObject* path = PySys_GetObject((char*)"path"); PyList_Append(path, PyUnicode_FromString(".")); |
PyObject* path = PySys_GetObject((char*)"path");
PyList_Append(path, PyUnicode_FromString("."));And, we can use the PyObject_GetIter and PyIter_Next method to go over each item and print them. Each element could be dynamic typed such as integer, float numbers, and unicode strings. These can be checked via PyLong_Check, PyFloat_Check and PyUnicode_Check accordingly.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | bool printPyList(PyObject* arr) { PyObject *iter; PyObject *item; if ((iter = PyObject_GetIter(arr)) == NULL) { printf("List is Empty.\n"); return false; } while ((item = PyIter_Next(iter)) != NULL) { if (PyLong_Check(item)) { long long_item = PyLong_AsLong(item); printf("%ld\n", long_item); } if (PyFloat_Check(item)) { float float_item = PyFloat_AsDouble(item); printf("%f\n", float_item); } if (PyUnicode_Check(item)) { const char *unicode_item = PyUnicode_AsUTF8(item); printf("%s\n", unicode_item); } Py_DECREF(item); } Py_DECREF(iter); return true; } |
bool printPyList(PyObject* arr) {
PyObject *iter;
PyObject *item;
if ((iter = PyObject_GetIter(arr)) == NULL) {
printf("List is Empty.\n");
return false;
}
while ((item = PyIter_Next(iter)) != NULL) {
if (PyLong_Check(item)) {
long long_item = PyLong_AsLong(item);
printf("%ld\n", long_item);
}
if (PyFloat_Check(item)) {
float float_item = PyFloat_AsDouble(item);
printf("%f\n", float_item);
}
if (PyUnicode_Check(item)) {
const char *unicode_item = PyUnicode_AsUTF8(item);
printf("%s\n", unicode_item);
}
Py_DECREF(item);
}
Py_DECREF(iter);
return true;
}If the list is empty, the above function will return false. Otherwise, each element will be printed to console line by line and the function returns true.
–EOF (The Ultimate Computing & Technology Blog) —
GD Star Rating
loading...
316 wordsloading...
Last Post: 5 Things to Look For in a WordPress Hosting Provider
Next Post: Teaching Kids Programming - Algorithms to Compute the Alternating Digit Sum
